But I wasn't happy doing soil mechanics and I told a friend of mine in South Africa - Wilfred Stein - he knew that - I'd written to him and told him that I was - what should I do? And I got a letter from him - he said I'd just been reading in the paper about scientists looking at the mechanical properties of cells when they divide: I think that's what you should do. And he was coming to King's College in London, and I went to the professor where he was going and I said, “Is there any chance that I could do this?" And he said, “Yes." And he arranged for me to do a PhD on the mechanics of cell division - so although I finished - I had a scholarship to do that course on soil mechanics, but when I finished it I went to King's College and started doing a PhD on the mechanics of cell division. [...] I mean living things are really so remarkable whereas I find soils not that interesting [laughs] I'm sorry to say. You know, the sea urchin egg which I spent a lot of time on: the way it develops into a sea urchin in so beautiful and the films I made with my friend Trygve were just amazing. I mean the cell is just the most remarkable evolutionary thing ever.